20
12 19 11 20 13 18 16 17 15 14 
15 17 20 13 16 11 19 14 12 18 
14 11 16 15 20 12 19 13 18 17 
17 18 14 12 16 13 20 11 19 15 
14 11 13 20 19 16 18 12 15 17 
14 18 11 20 15 13 17 16 12 19 
14 19 16 18 15 11 17 20 13 12 
20 15 19 11 17 12 16 14 18 13 
11 17 20 19 13 16 14 15 18 12 
13 18 19 14 20 12 16 17 11 15 
6 8 4 10 5 3 1 9 2 7 
2 8 6 7 1 10 3 4 9 5 
8 10 3 7 4 5 9 2 6 1 
1 8 6 3 9 7 10 4 5 2 
8 2 6 9 10 1 7 5 3 4 
8 2 1 6 9 10 5 7 3 4 
1 6 7 4 8 2 10 9 5 3 
9 6 10 2 7 3 1 5 4 8 
3 6 7 8 1 2 5 4 9 10 
7 3 1 10 4 5 2 9 6 8 
forbidden 1 11
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forbidden 1 19
forbidden 1 20
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forbidden 3 13
forbidden 3 16
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forbidden 4 13
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forbidden 5 15
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forbidden 6 19
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forbidden 8 11
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forbidden 8 19
forbidden 8 20
forbidden 9 13
forbidden 9 17
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forbidden 10 11
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forbidden 10 14
forbidden 10 16
forbidden 10 18
forbidden 10 19